Improvement in sewinq-machines



H. & 1. L0 MAX.

Sewing-Machines.

Pat-n-tefd May 26g 1874.

N0.l5l,406.

Grrro IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. ELQG, dated May 26, 1874; application filed July 19, 1873.

To all whom it may concern:

p Be it known that we, HENRY LOMAX and JOSEPH LOMAX, of Over Darwen, in the county of Lancaster and Kingdom of England, machine-makers, have invented certain new and useful Improvementsin Sewing-lilachines; and we do hereby declare that the following is a full, clear, and exact description thereof, that will enable others skilled in the art to which it appertains to make and use the same, reference being' had to the accompanying drawings, and `to the letters of reference marked thereon, which forni a part of this specification.

rlhis invention relates to improved appara tus for imparting motion to the needle-bar by means of an oscillating cam and bowl connected by a double crank and stud with the ordinary link of the needle-bar. The oscillating cam is supported on a stud, and the drivingshaft is passed through an aperture in the said cani. On the driving-shaft is an eecentric, which imparts to the cam the oscillation required, so as to reduce friction on or in the cam-groove employed for actuating and timing the needle-bar.

Such being the nature and object of this our said invention, we will now proceed to describe the saine in detail, and, in order that the same may be clearly understood, we have hereuntoannexed one sheet of drawings, and have marked the saine with figures and letters of reference, the saine letter referring to the same part in the various views or figures.

Figure l is a side elevation. Fig. 2 is a plan of needle-bar and double crank and stud. Fig. 3 is a detail view of cam and stud on which it oscillates. Fig. 4 is a side elevation of the needle-bar and double link for actuating the same.

O is the ordinary driving-pulley, through whichniotion is imparted to the shaft B, and it is provided with a disk 5 and, by means of this shaft B and its disk, motion is transmitted to suitable shafts, under the cloth-plate, through their disks, and a triangular link, E, coupling the whole together in such a manner as to produce positive and unvarying speed, thus avoiding the use of gear-wheels. G is the needle-bar, connected by the ordinary link G7 with a double crank and stud, G4; and motion is imparted to such needle-bar G by means of the driving-pulley O and shaft 13, having' an eccentric, H, passing through an oblong aperture, E2, formed in an oscillating cam, G1, and disk G2, carrying a double crank and stud, G4, connected by lilik G7 'with the needle-bar G, and provided with a bowl, G, that enters the cani-groove g in the face of the oscillating cam G1. rlhis cam G1 is supported eccentrieally ou a stud or pin, G5, and is provided with a cam-groove, g, by means of which the connecting-link G4 is actuated as the disk G2 is revolved. The oscillating motion is iinparted to the cam G1 by means of an eccentric, H, affixed upon the driving-shaft B, causing such 'cam Gl to oscillate freely on the stud or pin G5, as shown by Fig. 3 5 and, by these means, the friction on or in the cam-groove employed for actuating and timing the needle bar is greatly reduced. The construction of l the double link is fully shown in Figs. 3 and 4, drawn full size.

Vhat we Claim, and desire to secure by Letters Patent, is t The pivoted grooved cam G1, operated by an eccentric on the shaft B, and the revolving disk G2, in combination with the double cranklink G4, link G7, and needle-bar G, as and for the purposes described.

In testimony that we claim the foregoing we have hereunto set our hands this 21st day of March, 1873.

HENRY LOMAX. JOSEPH LOMAX. Witn esses:

C. DoNnon, A. C.k HALL. 

